20860417 has 4 divisors (see below), whose sum is σ = 20872260. Its totient is φ = 20848576.

The previous prime is 20860409. The next prime is 20860451. The reversal of 20860417 is 71406802.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 5875776 + 14984641 = 2424^2 + 3871^2 .

It is a cyclic number.

It is not a de Polignac number, because 20860417 - 2³ = 20860409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20860457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2692 + ... + 6997.

It is an arithmetic number, because the mean of its divisors is an integer number (5218065).

Almost surely, 2^20860417 is an apocalyptic number.

It is an amenable number.

20860417 is a deficient number, since it is larger than the sum of its proper divisors (11843).

20860417 is an equidigital number, since it uses as much as digits as its factorization.

20860417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11842.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 20860417 is about 4567.3205492936. The cubic root of 20860417 is about 275.2797901708.

The spelling of 20860417 in words is "twenty million, eight hundred sixty thousand, four hundred seventeen".